Roller.



LAURENT G. G. DIBBETS, OF THE HAGUE, NETHERLANDS;

ROLLER.

Specification of Letters Patent.

Patented Feb. 9, P915.

Application filed July 18, 1914. Serial No. 851,725.

To all whom it may concern:

Be it known that I, LAURENT G. G. DIB- BETS, a subject of the Queen ofthe Netherlands, and a resident of The Hague, Kingdom of theNetherlands, have invented a new and Improved Roller, of which the following is a full, clear, and exact description.

My invention relates to improvements on the rollers used in theKrajewski crusher, which is utilized for crushing and cutting sugarcanebefore the same enters the ordinary three-roller mill.

The Krajewski crusher is at the present time the most important andsuccessful accessory designed to increase the efficiency and output ofany form of cane-grinding plant to which it may beapplied. Thiscontrivance acts both as a crusher and as a preparer and equalizer ofthe feed of the cane as it enters the mill, and is now very generallyused in connection with a train of multiple mills. The essentialfeatures of the contrivance are two solid, cast-steel roll-,

ers about twenty-six inches in diameter and seventy-two inches inlength, each provided with pointed zigzag corrugations extendinglongitudinally of each roller. The corrugations on each of this pair ofrollers are arranged to mesh but not to touch when in motion. Therollers are kept at the minimum distance apart by properly constructedblocks, and the degree of their separation is controlled by powerfulsprings or by suitable hydraulic appliances. The efficiency of saidrollers decreases materially as soon as the edges of the zigzag teeth onthe rollers become blunt. The surface, due to wear, becomes highlypolished so that the teeth fail to grip and hold the cane and do notdraw the cane between the rollers for crushing, as intended. Thisfailure of the rollers to grip and carry the cane tends to anaccumulation or jam of the cane in front of the rollers. Thisnecessitates the breaking up of the jam by forcing the cane between therollers with poles or bars, which requires extra help and, therefore,more expense and delay.

To obviate the described defects of the rollers, and to make theoperation continuous, automatic and efficient, I have devised a rollerwhich has notches in the teeth thereof and which is illustrated in theaccompanying drawings forming a part of the specification, in whichsimilar characters of reference indicate corresponding parts in bothviews and Wherein Figure 1 is an elevation of a roller embodying myinvention; and Fig. 2 is a cross section on line 2-2, Fig. 1.

Referring to the drawings, 3 represents a roller the pointed zigzagcorrugations a of which form sharp-edged teeth, and, as can be seen fromthe drawing, appear to be formed of a longitudinal series of connectedVs, each branch of a V being provided with a notch 5, the effectivesurface 6 0 of which is substantially radial. The curved portion a b ofthe notch forms the retaining or gripping part, while the surface 6 c isthe tearing side. The notches of each of said zigzag-shaped teeth aresubstantially in alinement and parallel to the axis of the roller. Thesharp edges of these cut-outs or notches 5 of the teeth 4: are adaptedto grip the cane and thus prevent its slipping as the same is engagedbetween the rollers; they also help to tear and crush the cane. As shownin Fig. 1, the notches converge or diverge from the line joining theapex of the V and there by they are adapted to cover a maximum surface,2'. e., the area of their action is increased by disposing them asshown. These notches 5 may be recut at the beginning of each grindingseason, or at any other desired time, to keep the tearing and grippingedges sharp, that is, effective during the operation. The sharpening isdone by simply increas ing the width of the notch; particularly thesurface 6 c is attended to.

It will be observed that the tearing and gripping edges formed by thenotches can be maintained eflicient at very little expense and loss oftime, thus increasing the efiiciency of the crusher and rendering thesame automatic by obviating the am which takes place in front of theroller when the sharp edges of the teeth 4i become polished.

It is self-evident that existing rollers can be transformed into rollersembodying my invention by cutting out in the edges of the teeth 4 avolume a b 0 in each branch of the V forming a tooth, thus transformingan ordinary roller into a roller as described. It may be further notedthat in lieu of providing the notches 5 diverging or converging withreference to the line joining the apex of the teeth they may be madeparallel thereto or staggered successively as the practice may require.In a crushing mill both rollers may be provided With notches 5 in thesharp edges forming the teeth, but preferably the driving roller only isso provided With notches.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent:

1. A roller of the class described having sharp-edged, zigzag teethlongitudinal thereof, said sharp edges having notches in said edges.

2. A roller of the class described having sharp-edged, zigzag teethlongitudinal thereof, said edges having notches in each of the branchesof the zigzag teeth.

3. A roller of the class described having sharp-edged, zigzag teethlongitudinal thereof, said edges having notches in each of the branchesof the zigzag teeth, said notches in each of the teeth being inalinement and parallel to the axis of the roller.

4. A roller of the class described having sharp-edged, zigzag teethlongitudinal thereof, said edges having notches in each of the branchesof the zigzag teeth, each of said notches having one surface thereofsubstantially radial.

5. A roller of the class described hav ing sharp-edged, zigzag teethlongitudinal thereof, the edges of each of said teeth forming a seriesof VS, each branch of each V having a notch.

6. A roller of the class described having sharp-edged teeth longitudinalthereof, the edges of said teeth forming a series of VS, each branch ofeach V having a notch, said notches in each of the branches of thealining teeth being in alinement and substantially parallel to the axisof the roller, each of said notches having one surface thereofsubstantially radial and the other surface connecting the bottom of saidother surface With the edge of the tooth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

LAURENT G. G. DIBBETS.

Witnesses:

Orro CARL ADOLF Bnonn, ANTHONIE COLMAAD GEBHARD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

